Amazon, and I doubt it uses less than 300 watts, my cpu is heavily oc'd as is my gpu. Probably around 450watts at full load.

I plan to add another gtx 670 one day.

But my thermaltake psu doesn't seem to handle it nicely. E.g, when I load my cpu to 100%, the fan in it kicks in quite dramatically. (Dramatically as in, for a silent system, it wouldn't be noticeable to most people)

(It's not the cpu fan, because I have a corsair sp120 on it, and it's not pwm)

Mainly because it's fatal1ty, and it seems pretty modular, and there's a nice MIR.

That's not a particularly good PSU.

May I suggest newegg for a purchase? (there are excellent deals to be had there at the moment).
In which case my suggestions would be the following:Kingwin LZP 550W @ 112$ after promo code (you'll never see or hear the fan spinning with your current setup, or even if you add a second 670)Seasonic X 650 @ 90$, not as silent as the LZP but an excellent unit also at an equally excellent price.

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Any reccomednations ideas then? My main problem with that psu is that the cables are short. I know I am using a microatx case, but I route all the cables through the back and I have 6 devices that require sata power.

(1 dvd,1 bluray, 2 hds, and two ssds, I plan to add two more hard drives)

I mean I could probably open my psu and solder in another 140mm fan, but I don't know if it would push enough air if I got a 2nd 670.

This psu I have already seems to have heating issues according to jonnyguru's review.